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Daily Practice · GCSE Computer Science

July 2005 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in July 2005, with answers. Systems, data representation, networks, algorithms and programming.

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July 2005

31 sheets · 155 questions · GCSE

July 2005 compilationAll answers

Every sheet in July 2005

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st July 2005A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
  2. 2nd July 2005A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
  3. 3rd July 2005Give two reasons why network communication is divided into layers.
  4. 4th July 2005A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
  5. 5th July 2005A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
  6. 6th July 2005A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
  7. 7th July 2005An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.
  8. 8th July 2005Complete: NOT 0 = ?
  9. 9th July 2005Convert the 8-bit binary number 01011010 to denary.
  10. 10th July 2005State what LAN stands for.
  11. 11th July 2005Explain why an interpreter is often preferred while a program is being written.
  12. 12th July 2005An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
  13. 13th July 2005Which CPU register holds the address of the next instruction to be fetched?
  14. 14th July 2005Distinguish between the network security threats known as phishing and pharming.
  15. 15th July 2005A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
  16. 16th July 2005A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
  17. 17th July 2005A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
  18. 18th July 2005A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
  19. 19th July 2005State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
  20. 20th July 2005Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
  21. 21st July 2005Give one example of an optical secondary storage device.
  22. 22nd July 2005State the layer that IP operates in, and describe its job.
  23. 23rd July 2005State the term used for realistic data that a program would be expected to handle during normal use.
  24. 24th July 2005State what a foreign key is used for.
  25. 25th July 2005State the difference between lossy and lossless compression.
  26. 26th July 2005State the condition that must be met before a binary search can be used on an array.
  27. 27th July 2005A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
  28. 28th July 2005A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
  29. 29th July 2005Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
  30. 30th July 2005Describe what syntax highlighting is and how it helps a programmer.
  31. 31st July 2005Convert the denary number 45 to hexadecimal.